/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.configuration.description;

import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;

/**
 * Represents a text block in the {@link Description}.
 */
public class TextElement implements BlockElement, InlineElement {
	private final String format;
	private final List<InlineElement> elements;
	private final EnumSet<TextStyle> textStyles = EnumSet.noneOf(TextStyle.class);

	/**
	 * Creates a block of text with placeholders ("%s") that will be replaced with proper string representation of
	 * given {@link InlineElement}. For example:
	 *
	 * <p>{@code text("This is a text with a link %s", link("https://somepage", "to here"))}
	 *
	 * @param format text with placeholders for elements
	 * @param elements elements to be put in the text
	 * @return block of text
	 */
	public static TextElement text(String format, InlineElement... elements) {
		return new TextElement(format, Arrays.asList(elements));
	}

	/**
	 * Creates a simple block of text.
	 *
	 * @param text a simple block of text
	 * @return block of text
	 */
	public static TextElement text(String text) {
		return new TextElement(text, Collections.emptyList());
	}

	/**
	 * Creates a block of text formatted as code.
	 *
	 * @param text a block of text that will be formatted as code
	 * @return block of text formatted as code
	 */
	public static TextElement code(String text) {
		TextElement element = text(text);
		element.textStyles.add(TextStyle.CODE);
		return element;
	}

	public String getFormat() {
		return format;
	}

	public List<InlineElement> getElements() {
		return elements;
	}

	public EnumSet<TextStyle> getStyles() {
		return textStyles;
	}

	private TextElement(String format, List<InlineElement> elements) {
		this.format = format;
		this.elements = elements;
	}

	@Override
	public void format(Formatter formatter) {
		formatter.format(this);
	}

	/**
	 * Styles that can be applied to {@link TextElement} e.g. code, bold etc.
	 */
	public enum TextStyle {
		CODE
	}
}
